MEDIUM
8th Kerala Board
IMPORTANT
Earn 100

Most of the juices that we drink are liquids in the colloidal form. Such juices and liquids are available in the market. They do not settle down even after prolonged storage. Some chemical substances are used for this purpose. Are chemicals added to soft drinks only for this purpose? 

Important Questions on Solutions

MEDIUM
8th Kerala Board
IMPORTANT
Science for Class 8 - Part 2>Chapter 4 - Solutions>Exercise 8>Q 4
Most of the juices that we drink are liquids in the colloidal form. Such juices and liquids are available in the market. They do not settle down even after prolonged storage. Some chemical substances are used for this purpose. What are the other purposes for which chemical substances are added in soft drinks? 
HARD
8th Kerala Board
IMPORTANT
Science for Class 8 - Part 2>Chapter 4 - Solutions>Exercise 8>Q 5
Isn't it dangerous to add chemicals substances to soft drinks? How does the continuous use of soft drinks affect the human body?
HARD
8th Kerala Board
IMPORTANT
Science for Class 8 - Part 2>Chapter 4 - Solutions>Let us assess>Q 1

Given below are some solutions. Identify and write down the solvent and the solute present in them. (Hint: Those present in large amount is the solvent and that in small amount is the solute).

Solution Solvent Solute
Salt water    
Ornamental gold    
Soda water    
Dilute hydrochloric acid    
HARD
8th Kerala Board
IMPORTANT
Science for Class 8 - Part 2>Chapter 4 - Solutions>Let us assess>Q 2

Haven’t you noticed the caption “Shake well before use” in certain medicine bottles?

(a) To which class does the substances in them belong? (Colloid, Solution, Suspension)

(b) What is the relevance of such instructions on these bottles?

HARD
8th Kerala Board
IMPORTANT
Science for Class 8 - Part 2>Chapter 4 - Solutions>Let us assess>Q 3

Given below are some activities and observations done by a student using samples of dilute rice water, saltwater, and muddy water.

Activity Observation
Muddy water Salt water Dilute rice water
Passing a beam of light _____ Path of the beam of light is not visible _____
Filtering using a filter paper Components can be separated by filtration _____  
Keeping undisturbed for some time _____ _____ Particles do not settle down

a) Complete the table with the missing observations.
b) Classify these samples into solution, colloid, and suspension.

MEDIUM
8th Kerala Board
IMPORTANT
Science for Class 8 - Part 2>Chapter 4 - Solutions>Let us assess>Q 4
There are numerous instances in daily life where solutions are being used. Tabulate some of them.
MEDIUM
8th Kerala Board
IMPORTANT
Science for Class 8 - Part 2>Chapter 4 - Solutions>Let us assess>Q 5
You are now familiar with different types of solutions. What is the difference between saturated and supersaturated solutions?
MEDIUM
8th Kerala Board
IMPORTANT
Science for Class 8 - Part 2>Chapter 4 - Solutions>Let us assess>Q 5
You are now familiar with different types of solutions. How will you prepare a supersaturated solution of common salt?